[OPTICAL REVIEW Vol. 20, No. 1 (2013) 7-12]
© 2013 The Japan Society of Applied Physics

Removal of Residual Images in Parallel Phase-Shifting Digital Holography

Tatsuki TAHARA1,2, Yuki SHIMOZATO1, Peng XIA1, Yasunori ITO1, Takashi KAKUE1,2, Yasuhiro AWATSUJI1*, Kenzo NISHIO3, Shogo URA1, Toshihiro KUBOTA4, and Osamu MATOBA5

1Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
2Research Fellow of the Japan Society for the Promotion of Science, Sumitomo-Ichibancho FS Building, 8 Ichibancho, Chiyoda-ku, Tokyo 102-7472, Japan
3Advanced Technology Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
4Kubota Holography Laboratory Corporation, Nishihata 34-1-609, Ogura-cho, Uji, Kyoto 611-0042, Japan 5Graduate School of System Informatics, Kobe University, Rokkodai 1-1, Nada-ku, Kobe 657-8501, Japan

(Received April 27, 2012; Accepted November 1, 2012)

Parallel phase-shifting digital holography (PPSDH) is a technique of single-shot phase-shifting digital holography. We found that there are two problems with this technique. (1) Some extraneous noises caused by the intensity unevenness of the reference wave become slightly superimposed on the object image. (2) The conjugate image cannot be completely removed. This is because the object wave causes the phase-shift error by illuminating an image sensor with a large incident angle. To solve these problems, we propose an algorithm for removing residual 0th-order diffraction and conjugate images in PPSDH. In the proposed algorithm, we modified phase-shifting interferometry in order to work through the unevenness of the intensity distribution and applied the Fourier transform technique to PPSDH to remove the residual conjugate image. The effectiveness of the proposed algorithm was experimentally verified.

Key words: digital holography, three-dimensional imaging, image reconstruction technique, phase-shifting interferometry, holography

*E-mail address: awatsuji@kit.ac.jp